Review of American Standard for Railroad Highway Grade Crossing Protection (D8.1-1943) which provides additional safety for such crossings by recommending automatically operated gates wherever railroad and highway traffic is heavy enough to warrant them; gates are designed to be lowered at predetermined interval after signal begins to operate. (see also Ry Signaling v 36 n 9 Sept 1943 p 485-6)
Signals for safety at railroad-highway crossings
Indus Standardization
Industrial Standardization ; 14 , n 7
1943
3 pages
Article (Journal)
English
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Signals for safety at railroad-highway crossings
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